package com.heima.wemedia.filter;

import com.heima.model.common.threadlocal.WmThreadLocalUtils;
import com.heima.model.wemedia.pojos.WmUser;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.GenericFilterBean;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
 * @author mrchen
 * @date 2022/7/4 15:56
 */
@Component
@WebFilter(value = "authorFilter",urlPatterns = "/*")
@Slf4j
public class AuthorFilter extends GenericFilterBean {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        // 1. 获取请求中头的用户id
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        String userId = request.getHeader("userId");
        // 2. 如果存在 将用户id设置到线程变量中
        if(StringUtils.isNotBlank(userId)){
            WmUser wmUser = new WmUser();
            wmUser.setId(Integer.valueOf(userId));
            WmThreadLocalUtils.setUser(wmUser);
            log.info("当前登陆用户为: {}", userId);
        }
        // 3. 放行请求
        filterChain.doFilter(servletRequest,servletResponse);

        // 4. 清空threadlocal
        WmThreadLocalUtils.clear();
    }
}
